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  <script>
    /* 箭头函数参数：
    1.普通函数有arguments动态参数
    2. 箭头函数没有arguments动态参数，但是有 剩余参数...args
    */

    // 1.利用箭头函数来求和
    const getSum = (...arr) => {
      let sum = 0
      for (let i = 0; i < arr.length; i++) {
        sum += arr[i]
      }
      return sum
    }
    console.log(getSum(2, 3, 4))
  </script>
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